Idle Screw for CVK Carburetors & GY6 50cc (139QMB)

Idle Screw for CVK Carburetors on GY6 50cc Engines

This Idle Adjustment Screw is designed for CVK carburetors found in many GY6 50cc scooters. It allows for tool-free tuning, eliminating the hassle of needing a screwdriver for adjustments. This component is particularly useful for maintaining engine performance as weather conditions change. It is one of the straightforward GY6 50cc scooter parts to swap at home, ensuring your scooter runs smoothly.

Construction and Features

Made from precision-machined brass, this idle screw offers smooth threading and resistance to fuel and heat. It includes a high-tension spring, which keeps your settings secure even in high-vibration environments typical of GY6 engines. This design ensures reliable performance and minimizes the chances of losing your adjustments during operation.

Replacement Guidelines

Replacing the stock idle screw with this model is straightforward. It serves as a direct replacement for the OEM idle screw, making it easy to install. Observing the engine's temperature during installation is important; a warm engine will help achieve a steady RPM, typically between 1,600 and 1,900 RPM. This adjustment can prevent engine stalling at stoplights.

Specifications

• Material: Machined Brass
• Spring Included: Yes (High-Tension Steel)
• Compatibility: CVK / GY6 Style Carburetors
• OEM Part Number: 139QMB

Fitment

This idle screw is compatible with 50cc to 170cc 4-stroke engines using a CVK carburetor. The following models are confirmed fits:

• GY6 125cc / 150cc: Genuine Buddy 125/150, Wolf EX-150, TaoTao Lancer
• 139QMB / QMB139: TaoTao Powermax, Wolf Blaze II, etc.

Not sure it fits? Contact us with your scooter's make, model and year and we'll confirm the fit before you order.

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